gcc/tree-scalar-evolution.h

   1 /* Scalar evolution detector.
   2    Copyright (C) 2003-2017 Free Software Foundation, Inc.
   3    Contributed by Sebastian Pop <s.pop@laposte.net>
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify it under
   8 the terms of the GNU General Public License as published by the Free
   9 Software Foundation; either version 3, or (at your option) any later
  10 version.
  11
  12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15 for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING3.  If not see
  19 <http://www.gnu.org/licenses/>.  */
  20
  21 #ifndef GCC_TREE_SCALAR_EVOLUTION_H
  22 #define GCC_TREE_SCALAR_EVOLUTION_H
  23
  24 extern tree number_of_latch_executions (struct loop *);
  25 extern gcond *get_loop_exit_condition (const struct loop *);
  26
  27 extern void scev_initialize (void);
  28 extern bool scev_initialized_p (void);
  29 extern void scev_reset (void);
  30 extern void scev_reset_htab (void);
  31 extern void scev_finalize (void);
  32 extern tree analyze_scalar_evolution (struct loop *, tree);
  33 extern tree instantiate_scev (edge, struct loop *, tree);
  34 extern tree resolve_mixers (struct loop *, tree, bool *);
  35 extern void gather_stats_on_scev_database (void);
  36 extern void final_value_replacement_loop (struct loop *);
  37 extern unsigned int scev_const_prop (void);
  38 extern bool expression_expensive_p (tree);
  39 extern bool simple_iv_with_niters (struct loop *, struct loop *, tree,
  40                                    struct affine_iv *, tree *, bool);
  41 extern bool simple_iv (struct loop *, struct loop *, tree, struct affine_iv *,
  42                        bool);
  43 extern bool iv_can_overflow_p (struct loop *, tree, tree, tree);
  44 extern tree compute_overall_effect_of_inner_loop (struct loop *, tree);
  45
  46 /* Returns the basic block preceding LOOP, or the CFG entry block when
  47    the loop is function's body.  */
  48
  49 static inline basic_block
  50 block_before_loop (loop_p loop)
  51 {
  52   edge preheader = loop_preheader_edge (loop);
  53   return (preheader ? preheader->src : ENTRY_BLOCK_PTR_FOR_FN (cfun));
  54 }
  55
  56 /* Analyze all the parameters of the chrec that were left under a
  57    symbolic form.  LOOP is the loop in which symbolic names have to
  58    be analyzed and instantiated.  */
  59
  60 static inline tree
  61 instantiate_parameters (struct loop *loop, tree chrec)
  62 {
  63   return instantiate_scev (loop_preheader_edge (loop), loop, chrec);
  64 }
  65
  66 /* Returns the loop of the polynomial chrec CHREC.  */
  67
  68 static inline struct loop *
  69 get_chrec_loop (const_tree chrec)
  70 {
  71   return get_loop (cfun, CHREC_VARIABLE (chrec));
  72 }
  73
  74 #endif  /* GCC_TREE_SCALAR_EVOLUTION_H  */